{"id":"CVE-2023-34328","aliases":["ALPINE-CVE-2023-34328","DEBIAN-CVE-2023-34328","EUVD-2023-38409","GHSA-fm4g-p248-j5wj","SUSE-SU-2023:4054-1","SUSE-SU-2023:4055-1","SUSE-SU-2023:4174-1","SUSE-SU-2023:4183-1","SUSE-SU-2023:4184-1","SUSE-SU-2023:4185-1","SUSE-SU-2023:4475-1","SUSE-SU-2023:4476-1","UBUNTU-CVE-2023-34328"],"status":"published","title":"x86/AMD: Debug Mask handling","description":"[This CNA information record relates to multiple CVEs; the\ntext explains which aspects/vulnerabilities correspond to which CVE.]\n\nAMD CPUs since ~2014 have extensions to normal x86 debugging functionality.\nXen supports guests using these extensions.\n\nUnfortunately there are errors in Xen's handling of the guest state, leading\nto denials of service.\n\n 1) CVE-2023-34327 - An HVM vCPU can end up operating in the context of\n    a previous vCPUs debug mask state.\n\n 2) CVE-2023-34328 - A PV vCPU can place a breakpoint over the live GDT.\n    This allows the PV vCPU to exploit XSA-156 / CVE-2015-8104 and lock\n    up the CPU entirely.","severity":{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.00245,"percentile":0.15889,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"published":"2023-10-12T07:49:44Z","modified":"2026-10-26T18:02:18Z","fixes":[{"ecosystem":"Alpine:v3.15","package":"xen","fixed_in":["4.15.5-r3"],"sources":["osv"]},{"ecosystem":"Alpine:v3.16","package":"xen","fixed_in":["4.16.5-r3"],"sources":["osv"]},{"ecosystem":"Alpine:v3.17","package":"xen","fixed_in":["4.16.5-r3"],"sources":["osv"]},{"ecosystem":"Alpine:v3.18","package":"xen","fixed_in":["4.17.2-r3"],"sources":["osv"]},{"ecosystem":"Alpine:v3.19","package":"xen","fixed_in":["4.17.2-r3"],"sources":["osv"]},{"ecosystem":"Alpine:v3.20","package":"xen","fixed_in":["4.17.2-r3"],"sources":["osv"]},{"ecosystem":"Alpine:v3.21","package":"xen","fixed_in":["4.17.2-r3"],"sources":["osv"]},{"ecosystem":"Alpine:v3.22","package":"xen","fixed_in":["4.17.2-r3"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"xen","fixed_in":["4.17.2-r3"],"sources":["osv"]},{"ecosystem":"Alpine:v3.24","package":"xen","fixed_in":["4.17.2-r3"],"sources":["osv"]},{"ecosystem":"Debian:12","package":"xen","fixed_in":["4.17.2+76-ge1f9cb16e2-1~deb12u1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"xen","fixed_in":["4.17.2+55-g0b56bed864-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"xen","fixed_in":["4.17.2+55-g0b56bed864-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Alpine:v3.15","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.5.0"},{"fixed":"4.15.5-r3"}]}]},{"source":"osv","ecosystem":"Alpine:v3.16","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.5.0"},{"fixed":"4.16.5-r3"}]}]},{"source":"osv","ecosystem":"Alpine:v3.17","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.5.0"},{"fixed":"4.16.5-r3"}]}]},{"source":"osv","ecosystem":"Alpine:v3.18","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.5.0"},{"fixed":"4.17.2-r3"}]}]},{"source":"osv","ecosystem":"Alpine:v3.19","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.5.0"},{"fixed":"4.17.2-r3"}]}]},{"source":"osv","ecosystem":"Alpine:v3.20","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.5.0"},{"fixed":"4.17.2-r3"}]}]},{"source":"osv","ecosystem":"Alpine:v3.21","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.5.0"},{"fixed":"4.17.2-r3"}]}]},{"source":"osv","ecosystem":"Alpine:v3.22","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.5.0"},{"fixed":"4.17.2-r3"}]}]},{"source":"osv","ecosystem":"Alpine:v3.23","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.5.0"},{"fixed":"4.17.2-r3"}]}]},{"source":"osv","ecosystem":"Alpine:v3.24","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.5.0"},{"fixed":"4.17.2-r3"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.17.2+76-ge1f9cb16e2-1~deb12u1"}]}],"versions":["4.17.1+2-gb773c48e36-1","4.17.2+55-g0b56bed864-1","4.17.2-1"]},{"source":"osv","ecosystem":"Debian:13","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.17.2+55-g0b56bed864-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.17.2+55-g0b56bed864-1"}]}]},{"source":"osv","ecosystem":"SUSE:Linux 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Debug Mask handling","description":"\n[This CNA information record relates to multiple CVEs; the\ntext explains which aspects/vulnerabilities correspond to which CVE.]\n\nAMD CPUs since ~2014 have extensions to normal x86 debugging functionality.\nXen supports guests using these extensions.\n\nUnfortunately there are errors in Xen's handling of the guest state, leading\nto denials of service.\n\n 1) CVE-2023-34327 - An HVM vCPU can end up operating in the context of\n    a previous vCPUs debug mask state.\n\n 2) CVE-2023-34328 - A PV vCPU can place a breakpoint over the live GDT.\n    This allows the PV vCPU to exploit XSA-156 / CVE-2015-8104 and lock\n    up the CPU 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entirely.\n","status":"published","published":"2024-01-05T16:34:11Z","modified":"2025-11-04T19:16:42Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T19:49:22.434386Z"}],"ghsa":[{"id":"GHSA-fm4g-p248-j5wj","title":"[This CNA information record relates to multiple CVEs; the\ntext explains which aspects...","description":"[This CNA information record relates to multiple CVEs; the\ntext explains which aspects/vulnerabilities correspond to which CVE.]\n\nAMD CPUs since ~2014 have extensions to normal x86 debugging functionality.\nXen supports guests using these extensions.\n\nUnfortunately there are errors in Xen's handling of the guest state, leading\nto denials of service.\n\n 1) CVE-2023-34327 - An HVM vCPU can end up operating in the context of\n    a previous vCPUs debug mask state.\n\n 2) CVE-2023-34328 - A PV vCPU can place a breakpoint over the live GDT.\n    This allows the PV vCPU to exploit XSA-156 / CVE-2015-8104 and lock\n    up the CPU entirely.","status":"published","published":"2024-01-05T18:30:25Z","modified":"2025-11-04T21:30:55Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:04:36.009389Z"}],"nvd":[{"id":"CVE-2023-34328","description":"\n[This CNA information record relates to multiple CVEs; the\ntext explains which aspects/vulnerabilities correspond to which CVE.]\n\nAMD CPUs since ~2014 have extensions to normal x86 debugging functionality.\nXen supports guests using these extensions.\n\nUnfortunately there are errors in Xen's handling of the guest state, leading\nto denials of service.\n\n 1) CVE-2023-34327 - An HVM vCPU can end up operating in the context of\n    a previous vCPUs debug mask state.\n\n 2) CVE-2023-34328 - A PV vCPU can place a breakpoint over the live GDT.\n    This allows the PV vCPU to exploit XSA-156 / CVE-2015-8104 and lock\n    up the CPU entirely.\n","status":"published","published":"2024-01-05T17:15:08.73Z","modified":"2026-06-17T06:03:24.24Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary"},{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"}],"updated_at":"2026-11-02T14:08:59.830468Z"}],"osv":[{"id":"ALPINE-CVE-2023-34328","description":"\n[This CNA information record relates to multiple CVEs; the\ntext explains which aspects/vulnerabilities correspond to which CVE.]\n\nAMD CPUs since ~2014 have extensions to normal x86 debugging functionality.\nXen supports guests using these extensions.\n\nUnfortunately there are errors in Xen's handling of the guest state, leading\nto denials of service.\n\n 1) CVE-2023-34327 - An HVM vCPU can end up operating in the context of\n    a previous vCPUs debug mask state.\n\n 2) CVE-2023-34328 - A PV vCPU can place a breakpoint over the live GDT.\n    This allows the PV vCPU to exploit XSA-156 / CVE-2015-8104 and lock\n    up the CPU entirely.\n","status":"published","published":"2024-01-05T17:15:08.73Z","modified":"2026-10-26T17:17:58.627462816Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:27:49.709457Z"},{"id":"CVE-2023-34328","description":"\n[This CNA information record relates to multiple CVEs; the\ntext explains which aspects/vulnerabilities correspond to which CVE.]\n\nAMD CPUs since ~2014 have extensions to normal x86 debugging functionality.\nXen supports guests using these extensions.\n\nUnfortunately there are errors in Xen's handling of the guest state, leading\nto denials of service.\n\n 1) CVE-2023-34327 - An HVM vCPU can end up operating in the context of\n    a previous vCPUs debug mask state.\n\n 2) CVE-2023-34328 - A PV vCPU can place a breakpoint over the live GDT.\n    This allows the PV vCPU to exploit XSA-156 / CVE-2015-8104 and lock\n    up the CPU entirely.\n","status":"published","published":"2024-01-05T17:15:08.73Z","modified":"2026-03-14T12:07:22.695384Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:44:32.116263Z"},{"id":"DEBIAN-CVE-2023-34328","description":"[This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.]  AMD CPUs since ~2014 have extensions to normal x86 debugging functionality. Xen supports guests using these extensions.  Unfortunately there are errors in Xen's handling of the guest state, leading to denials of service.   1) CVE-2023-34327 - An HVM vCPU can end up operating in the context of     a previous vCPUs debug mask state.   2) CVE-2023-34328 - A PV vCPU can place a breakpoint over the live GDT.     This allows the PV vCPU to exploit XSA-156 / CVE-2015-8104 and lock     up the CPU entirely.","status":"published","published":"2024-01-05T17:15:08.73Z","modified":"2026-10-26T18:02:18.338747787Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:45:39.679062Z"},{"id":"UBUNTU-CVE-2023-34328","description":"[This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] AMD CPUs since ~2014 have extensions to normal x86 debugging functionality. Xen supports guests using these extensions. Unfortunately there are errors in Xen's handling of the guest state, leading to denials of service.  1) CVE-2023-34327 - An HVM vCPU can end up operating in the context of     a previous vCPUs debug mask state.  2) CVE-2023-34328 - A PV vCPU can place a breakpoint over the live GDT.     This allows the PV vCPU to exploit XSA-156 / CVE-2015-8104 and lock     up the CPU entirely.","status":"published","published":"2024-01-05T17:15:00Z","modified":"2026-10-17T12:57:19.043933971Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"},{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T16:54:21.882004Z"},{"id":"SUSE-SU-2023:4054-1","title":"Security update for xen","description":"This update for xen fixes the following issues:\n\n- CVE-2023-34323: A transaction conflict can crash C Xenstored (XSA-440, bsc#1215744)\n- CVE-2023-34326: Missing IOMMU TLB flushing (XSA-442, bsc#1215746)\n- CVE-2023-34325: Multiple vulnerabilities in libfsimage disk handling (XSA-443, bsc#1215747)\n- CVE-2023-34327: Debug Mask handling (XSA-444, bsc#1215748)\n- CVE-2023-34328: Debug Mask handling (XSA-444, bsc#1215748)\n","status":"published","published":"2023-10-12T07:49:44Z","modified":"2026-02-04T04:40:20.819269Z","updated_at":"2026-11-02T15:53:53.440387Z"},{"id":"SUSE-SU-2023:4055-1","title":"Security update for xen","description":"This update for xen fixes the following issues:\n\n- CVE-2023-34323: A transaction conflict can crash C Xenstored (XSA-440, bsc#1215744)\n- CVE-2023-34326: Missing IOMMU TLB flushing (XSA-442, bsc#1215746)\n- CVE-2023-34325: Multiple vulnerabilities in libfsimage disk handling (XSA-443, bsc#1215747)\n- CVE-2023-34327: Debug Mask handling (XSA-444, bsc#1215748)\n- CVE-2023-34328: Debug Mask handling (XSA-444, bsc#1215748)\n","status":"published","published":"2023-10-12T07:51:07Z","modified":"2025-05-02T04:35:04.149104Z","updated_at":"2026-11-02T15:53:53.440387Z"},{"id":"SUSE-SU-2023:4174-1","title":"Security update for xen","description":"This update for xen fixes the following issues:\n\n- CVE-2023-34323: Fixed a potential crash in C Xenstored due to an\n  incorrect assertion (XSA-440) (bsc#1215744).\n- CVE-2023-34326: Fixed a missing IOMMU TLB flush on x86 AMD systems\n  with IOMMU hardware and PCI passthrough enabled (XSA-442)\n  (bsc#1215746).\n- CVE-2023-34325: Fixed multiple parsing issues in libfsimage\n  (XSA-443) (bsc#1215747).\n- CVE-2023-34327, CVE-2023-34328: Fixed multiple issues with AMD x86\n  debugging functionality for guests (XSA-444) (bsc#1215748).\n","status":"published","published":"2023-10-24T10:36:52Z","modified":"2026-02-04T03:39:09.195879Z","updated_at":"2026-11-02T15:53:53.865042Z"},{"id":"SUSE-SU-2023:4183-1","title":"Security update for xen","description":"This update for xen fixes the following issues:\n\n- CVE-2023-34323: Fixed a potential crash in C Xenstored due to an\n  incorrect assertion (XSA-440) (bsc#1215744).\n- CVE-2023-34326: Fixed a missing IOMMU TLB flush on x86 AMD systems\n  with IOMMU hardware and PCI passthrough enabled (XSA-442)\n  (bsc#1215746).\n- CVE-2023-34325: Fixed multiple parsing issues in libfsimage\n  (XSA-443) (bsc#1215747).\n- CVE-2023-34327, CVE-2023-34328: Fixed multiple issues with AMD x86\n  debugging functionality for guests (XSA-444) (bsc#1215748).\n","status":"published","published":"2023-10-24T14:52:38Z","modified":"2026-02-04T03:54:36.916952Z","updated_at":"2026-11-02T15:53:53.865042Z"},{"id":"SUSE-SU-2023:4184-1","title":"Security update for xen","description":"This update for xen fixes the following issues:\n\n- CVE-2023-34323: Fixed a potential crash in C Xenstored due to an\n  incorrect assertion (XSA-440) (bsc#1215744).\n- CVE-2023-34326: Fixed a missing IOMMU TLB flush on x86 AMD systems\n  with IOMMU hardware and PCI passthrough enabled (XSA-442)\n  (bsc#1215746).\n- CVE-2023-34325: Fixed multiple parsing issues in libfsimage\n  (XSA-443) (bsc#1215747).\n- CVE-2023-34327, CVE-2023-34328: Fixed multiple issues with AMD x86\n  debugging functionality for guests (XSA-444) (bsc#1215748).\n","status":"published","published":"2023-10-24T14:52:50Z","modified":"2026-02-04T03:43:48.089395Z","updated_at":"2026-11-02T15:53:53.865042Z"},{"id":"SUSE-SU-2023:4185-1","title":"Security update for xen","description":"This update for xen fixes the following issues:\n\n- CVE-2023-34323: Fixed a potential crash in C Xenstored due to an\n  incorrect assertion (XSA-440) (bsc#1215744).\n- CVE-2023-34326: Fixed a missing IOMMU TLB flush on x86 AMD systems\n  with IOMMU hardware and PCI passthrough enabled (XSA-442)\n  (bsc#1215746).\n- CVE-2023-34325: Fixed multiple parsing issues in libfsimage\n  (XSA-443) (bsc#1215747).\n- CVE-2023-34327, CVE-2023-34328: Fixed multiple issues with AMD x86\n  debugging functionality for guests (XSA-444) (bsc#1215748).\n","status":"published","published":"2023-10-24T14:53:12Z","modified":"2026-02-04T03:25:29.836892Z","updated_at":"2026-11-02T15:53:53.865042Z"},{"id":"SUSE-SU-2023:4475-1","title":"Security update for xen","description":"This update for xen fixes the following issues:\n\n- CVE-2023-20588: AMD CPU transitional execution leak via division by zero (XSA-439) (bsc#1215474).\n- CVE-2023-34322: top-level shadow reference dropped too early for 64-bit PV guests (XSA-438) (bsc#1215145).\n- CVE-2023-34325: Multiple vulnerabilities in libfsimage disk handling (XSA-443) (bsc#1215747).\n- CVE-2023-34326: x86/AMD: missing IOMMU TLB flushing (XSA-442) (bsc#1215746).\n- CVE-2023-34327,CVE-2023-34328: x86/AMD: Debug Mask handling (XSA-444) (bsc#1215748).\n- CVE-2023-46835: x86/AMD: mismatch in IOMMU quarantine page table levels (XSA-445) (bsc#1216654).\n- CVE-2023-46836: x86: BTC/SRSO fixes not fully effective (XSA-446) (bsc#1216807).\n\n- Upstream bug fixes (bsc#1027519)\n","status":"published","published":"2023-11-17T07:05:29Z","modified":"2026-02-04T02:57:55.595655Z","updated_at":"2026-11-02T15:53:53.865042Z"},{"id":"SUSE-SU-2023:4476-1","title":"Security update for xen","description":"This update for xen fixes the following issues:\n\n- CVE-2023-20588: AMD CPU transitional execution leak via division by zero (XSA-439) (bsc#1215474).\n- CVE-2023-34322: top-level shadow reference dropped too early for 64-bit PV guests (XSA-438) (bsc#1215145).\n- CVE-2023-34325: Multiple vulnerabilities in libfsimage disk handling (XSA-443) (bsc#1215747).\n- CVE-2023-34326: x86/AMD: missing IOMMU TLB flushing (XSA-442) (bsc#1215746).\n- CVE-2023-34327,CVE-2023-34328: x86/AMD: Debug Mask handling (XSA-444) (bsc#1215748).\n- CVE-2023-46835: x86/AMD: mismatch in IOMMU quarantine page table levels (XSA-445) (bsc#1216654).\n- CVE-2023-46836: x86: BTC/SRSO fixes not fully effective (XSA-446) (bsc#1216807). \n\n- Upstream bug fixes (bsc#1027519) \n","status":"published","published":"2023-11-17T07:05:47Z","modified":"2026-02-04T03:22:05.228354Z","updated_at":"2026-11-02T15:53:53.865042Z"}]}}